单项选择题
A.±0.50D B.±0.37D C.±0.12D D.±0.25D
A.±8° B.±4° C.±6° D.±2°
A.±15° B.±9° C.±5° D.±10°
A.±3° B.±5° C.±8° D.±10°
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